Failed to delete pools

Hi!

I don't know if it is bug or I missed something.
The deletion of an empty pool failed with message:
This pool contained some test-vms which I removed before trying to delete this pool.

Deletion of another pool failed with an other message. After a click on the pool this message comes up:

Maybe those errors have the same reason.

Thanks for your help!

Update:
After rebooting the node, the second error disappears, but I am still not able to delete any pool.

I couldn't reproduce these errors.
I tried, but now I can add/delete users/pools/vms without any failure....

I will let you know, if something goes wrong again.

Thanks for your help!